Firewall
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access and cyber threats. Firewalls can be implemented as hardware devices, software applications, or cloud-based services, and they are fundamental to securing modern IT infrastructure.
Developers should learn about firewalls to implement secure network architectures, protect applications and data from attacks like DDoS, malware, and unauthorized intrusions, and ensure compliance with security standards. This is crucial in scenarios such as deploying web applications, managing cloud environments, or setting up corporate networks, where controlling traffic flow and enforcing security policies is essential for operational safety.